
// 项目在发布时需要用到的babel插件数组
const proPlugins = []
// 如果当前是生产环境，则使用去掉console的插件
if (process.env.NODE_ENV === 'production') {
  proPlugins.push('transform-remove-console')
}
module.exports = {
  presets: [
    // https://github.com/vuejs/vue-cli/tree/master/packages/@vue/babel-preset-app
    '@vue/cli-plugin-babel/preset'
  ],
  'env': {
    'development': {
      // babel-plugin-dynamic-import-node plugin only does one thing by converting all import() to require().
      // This plugin can significantly increase the speed of hot updates, when you have a large number of pages.
      // https://panjiachen.github.io/vue-element-admin-site/guide/advanced/lazy-loading.html
      'plugins': ['dynamic-import-node']
    }
  },
  plugins: [
    '@babel/plugin-proposal-optional-chaining', // 可选链 ?.
    '@babel/plugin-proposal-nullish-coalescing-operator', // 空值合并 ??
    ...proPlugins
  ]
}
